That's why food processors were invented! You wouldn't believe the things I slip into food(nutrition wise). I'm such a sneak :)
ME TOO!! I have this recipe I invented for the kids called "Swamp Lasagna", Princess Fiona gave me the recipe *wink wink*. You take frozen chopped spinach and thaw it without cooking. Then you put cooked noodles, sauce, cheese and spinach in the layers and just warm to melt the cheese in the oven (that way the spinach doesn't 'cook', it has a much stronger flavor cooked over raw) and it looks all swampy. They have no idea they are eating spinach!
And also, squash has the same texture of spaghetti, so I boil sliced sqaush with the noodles and they have no idea they are eating sqaush mixed in their spaghetti.